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Evaluation of power losses due to reduced power quality

Journal: Reporter of the Priazovskyi State Technical University. Section: Technical sciences (Vol.34, No. 1)

Publication Date:

Authors : ;

Page : 119-126

Keywords : power quality; power losses; voltage and current waveform distortion; higher har-monic; spectral composition of the current; transformer;

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A comparative analysis of the known methods of calculating additional power losses caused by a decrease in its quality has been performed. It has been shown that the known methods of estimating additional power losses assume the use of a large amount of initial information as to the parameters of electrical equipment and the electric network regime, which makes their application unnecessarily complex and time-consuming in a significant number of cases. Based on the analysis, a classification has been developed and possible areas of applying these methods have been defined, and the requirements for them have been formulated. Using the example of determining the additional power losses caused by distortion of the shapes of the current and voltage curves, it has been shown that the known techniques assume the use of data on the values of higher harmonics of currents in individual branches of the electric network as the initial information. It is suggested, in the future, to consider the possibility of using as the initial data of this calculation the values of the higher harmonics of the voltages at the network nodes, which will simplify the calculation. At the same time, the resulting underestimation of losses can be eliminated by introducing correction factors that take into account the increase in the currents of higher harmonics in individual branches

Last modified: 2018-04-11 20:30:37